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C#

Multiple Column ComboBox

//  DataSource setup: 
//   
//  Create a Table named Test and add 2 columns 
//   ID:     int 
//   Name:   string 
// 
DataTable dtTest = new DataTable(); 
dtTest.Columns.Add("ID", typeof(int)); 
dtTest.Columns.Add("Name", typeof(string)); 

dtTest.Rows.Add(1, "John"); 
dtTest.Rows.Add(2, "Amy"); 
dtTest.Rows.Add(3, "Tony"); 
dtTest.Rows.Add(4, "Bruce"); 
dtTest.Rows.Add(5, "Allen"); 

// Bind the ComboBox to the DataTable 
this.comboBox1.DataSource = dtTest; 
this.comboBox1.DisplayMember = "Name"; 
this.comboBox1.ValueMember = "ID"; 

// Enable the owner draw on the ComboBox. 
this.comboBox1.DrawMode = DrawMode.OwnerDrawFixed; 
// Handle the DrawItem event to draw the items. 
this.comboBox1.DrawItem += delegate(object cmb, DrawItemEventArgs args) 
{ 
    // Draw the default background 
    args.DrawBackground(); 


    // The ComboBox is bound to a DataTable, 
    // so the items are DataRowView objects. 
    DataRowView drv = (DataRowView)this.comboBox1.Items[args.Index]; 

    // Retrieve the value of each column. 
    string id = drv["id"].ToString(); 
    string name = drv["name"].ToString(); 

    // Get the bounds for the first column 
    Rectangle r1 = args.Bounds; 
    r1.Width /= 2; 

    // Draw the text on the first column 
    using (SolidBrush sb = new SolidBrush(args.ForeColor)) 
    { 
        args.Graphics.DrawString(id, args.Font, sb, r1); 
    } 

    // Draw a line to isolate the columns  
    using (Pen p = new Pen(Color.Black)) 
    { 
        args.Graphics.DrawLine(p, r1.Right, 0, r1.Right, r1.Bottom); 
    } 

    // Get the bounds for the second column 
    Rectangle r2 = args.Bounds; 
    r2.X = args.Bounds.Width/2; 
    r2.Width /= 2; 

    // Draw the text on the second column 
    using (SolidBrush sb = new SolidBrush(args.ForeColor)) 
    { 
        args.Graphics.DrawString(name, args.Font, sb, r2); 
    } 
}; 
https://snipt.net/embed/cac566d706dcfd066cd9fe4fc3b54a4f/
/raw/cac566d706dcfd066cd9fe4fc3b54a4f/
cac566d706dcfd066cd9fe4fc3b54a4f
csharp
C#
65
2019-06-27T08:01:22
True
False
False
/api/public/snipt/38435/
multiple-column-combobox
<table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><a href="#L-1"> 1</a> <a href="#L-2"> 2</a> <a href="#L-3"> 3</a> <a href="#L-4"> 4</a> <a href="#L-5"> 5</a> <a href="#L-6"> 6</a> <a href="#L-7"> 7</a> <a href="#L-8"> 8</a> <a href="#L-9"> 9</a> <a href="#L-10">10</a> <a href="#L-11">11</a> <a href="#L-12">12</a> <a href="#L-13">13</a> <a href="#L-14">14</a> <a href="#L-15">15</a> <a href="#L-16">16</a> <a href="#L-17">17</a> <a href="#L-18">18</a> <a href="#L-19">19</a> <a href="#L-20">20</a> <a href="#L-21">21</a> <a href="#L-22">22</a> <a href="#L-23">23</a> <a href="#L-24">24</a> <a href="#L-25">25</a> <a href="#L-26">26</a> <a href="#L-27">27</a> <a href="#L-28">28</a> <a href="#L-29">29</a> <a href="#L-30">30</a> <a href="#L-31">31</a> <a href="#L-32">32</a> <a href="#L-33">33</a> <a href="#L-34">34</a> <a href="#L-35">35</a> <a href="#L-36">36</a> <a href="#L-37">37</a> <a href="#L-38">38</a> <a href="#L-39">39</a> <a href="#L-40">40</a> <a href="#L-41">41</a> <a href="#L-42">42</a> <a href="#L-43">43</a> <a href="#L-44">44</a> <a href="#L-45">45</a> <a href="#L-46">46</a> <a href="#L-47">47</a> <a href="#L-48">48</a> <a href="#L-49">49</a> <a href="#L-50">50</a> <a href="#L-51">51</a> <a href="#L-52">52</a> <a href="#L-53">53</a> <a href="#L-54">54</a> <a href="#L-55">55</a> <a href="#L-56">56</a> <a href="#L-57">57</a> <a href="#L-58">58</a> <a href="#L-59">59</a> <a href="#L-60">60</a> <a href="#L-61">61</a> <a href="#L-62">62</a> <a href="#L-63">63</a> <a href="#L-64">64</a> <a href="#L-65">65</a></pre></div></td><td class="code"><div class="highlight"><pre><span></span><span id="L-1"><a name="L-1"></a><span class="c1">// DataSource setup: </span> </span><span id="L-2"><a name="L-2"></a><span class="c1">// </span> </span><span id="L-3"><a name="L-3"></a><span class="c1">// Create a Table named Test and add 2 columns </span> </span><span id="L-4"><a name="L-4"></a><span class="c1">// ID: int </span> </span><span id="L-5"><a name="L-5"></a><span class="c1">// Name: string </span> </span><span id="L-6"><a name="L-6"></a><span class="c1">// </span> </span><span id="L-7"><a name="L-7"></a><span class="n">DataTable</span> <span class="n">dtTest</span> <span class="p">=</span> <span class="k">new</span> <span class="n">DataTable</span><span class="p">();</span> </span><span id="L-8"><a name="L-8"></a><span class="n">dtTest</span><span class="p">.</span><span class="n">Columns</span><span class="p">.</span><span class="n">Add</span><span class="p">(</span><span class="s">&quot;ID&quot;</span><span class="p">,</span> <span class="k">typeof</span><span class="p">(</span><span class="kt">int</span><span class="p">));</span> </span><span id="L-9"><a name="L-9"></a><span class="n">dtTest</span><span class="p">.</span><span class="n">Columns</span><span class="p">.</span><span class="n">Add</span><span class="p">(</span><span class="s">&quot;Name&quot;</span><span class="p">,</span> <span class="k">typeof</span><span class="p">(</span><span class="kt">string</span><span class="p">));</span> </span><span id="L-10"><a name="L-10"></a> </span><span id="L-11"><a name="L-11"></a><span class="n">dtTest</span><span class="p">.</span><span class="n">Rows</span><span class="p">.</span><span class="n">Add</span><span class="p">(</span><span class="m">1</span><span class="p">,</span> <span class="s">&quot;John&quot;</span><span class="p">);</span> </span><span id="L-12"><a name="L-12"></a><span class="n">dtTest</span><span class="p">.</span><span class="n">Rows</span><span class="p">.</span><span class="n">Add</span><span class="p">(</span><span class="m">2</span><span class="p">,</span> <span class="s">&quot;Amy&quot;</span><span class="p">);</span> </span><span id="L-13"><a name="L-13"></a><span class="n">dtTest</span><span class="p">.</span><span class="n">Rows</span><span class="p">.</span><span class="n">Add</span><span class="p">(</span><span class="m">3</span><span class="p">,</span> <span class="s">&quot;Tony&quot;</span><span class="p">);</span> </span><span id="L-14"><a name="L-14"></a><span class="n">dtTest</span><span class="p">.</span><span class="n">Rows</span><span class="p">.</span><span class="n">Add</span><span class="p">(</span><span class="m">4</span><span class="p">,</span> <span class="s">&quot;Bruce&quot;</span><span class="p">);</span> </span><span id="L-15"><a name="L-15"></a><span class="n">dtTest</span><span class="p">.</span><span class="n">Rows</span><span class="p">.</span><span class="n">Add</span><span class="p">(</span><span class="m">5</span><span class="p">,</span> <span class="s">&quot;Allen&quot;</span><span class="p">);</span> </span><span id="L-16"><a name="L-16"></a> </span><span id="L-17"><a name="L-17"></a><span class="c1">// Bind the ComboBox to the DataTable </span> </span><span id="L-18"><a name="L-18"></a><span class="k">this</span><span class="p">.</span><span class="n">comboBox1</span><span class="p">.</span><span class="n">DataSource</span> <span class="p">=</span> <span class="n">dtTest</span><span class="p">;</span> </span><span id="L-19"><a name="L-19"></a><span class="k">this</span><span class="p">.</span><span class="n">comboBox1</span><span class="p">.</span><span class="n">DisplayMember</span> <span class="p">=</span> <span class="s">&quot;Name&quot;</span><span class="p">;</span> </span><span id="L-20"><a name="L-20"></a><span class="k">this</span><span class="p">.</span><span class="n">comboBox1</span><span class="p">.</span><span class="n">ValueMember</span> <span class="p">=</span> <span class="s">&quot;ID&quot;</span><span class="p">;</span> </span><span id="L-21"><a name="L-21"></a> </span><span id="L-22"><a name="L-22"></a><span class="c1">// Enable the owner draw on the ComboBox. </span> </span><span id="L-23"><a name="L-23"></a><span class="k">this</span><span class="p">.</span><span class="n">comboBox1</span><span class="p">.</span><span class="n">DrawMode</span> <span class="p">=</span> <span class="n">DrawMode</span><span class="p">.</span><span class="n">OwnerDrawFixed</span><span class="p">;</span> </span><span id="L-24"><a name="L-24"></a><span class="c1">// Handle the DrawItem event to draw the items. </span> </span><span id="L-25"><a name="L-25"></a><span class="k">this</span><span class="p">.</span><span class="n">comboBox1</span><span class="p">.</span><span class="n">DrawItem</span> <span class="p">+=</span> <span class="k">delegate</span><span class="p">(</span><span class="kt">object</span> <span class="n">cmb</span><span class="p">,</span> <span class="n">DrawItemEventArgs</span> <span class="n">args</span><span class="p">)</span> </span><span id="L-26"><a name="L-26"></a><span class="p">{</span> </span><span id="L-27"><a name="L-27"></a> <span class="c1">// Draw the default background </span> </span><span id="L-28"><a name="L-28"></a> <span class="n">args</span><span class="p">.</span><span class="n">DrawBackground</span><span class="p">();</span> </span><span id="L-29"><a name="L-29"></a> </span><span id="L-30"><a name="L-30"></a> </span><span id="L-31"><a name="L-31"></a> <span class="c1">// The ComboBox is bound to a DataTable, </span> </span><span id="L-32"><a name="L-32"></a> <span class="c1">// so the items are DataRowView objects. </span> </span><span id="L-33"><a name="L-33"></a> <span class="n">DataRowView</span> <span class="n">drv</span> <span class="p">=</span> <span class="p">(</span><span class="n">DataRowView</span><span class="p">)</span><span class="k">this</span><span class="p">.</span><span class="n">comboBox1</span><span class="p">.</span><span class="n">Items</span><span class="p">[</span><span class="n">args</span><span class="p">.</span><span class="n">Index</span><span class="p">];</span> </span><span id="L-34"><a name="L-34"></a> </span><span id="L-35"><a name="L-35"></a> <span class="c1">// Retrieve the value of each column. </span> </span><span id="L-36"><a name="L-36"></a> <span class="kt">string</span> <span class="n">id</span> <span class="p">=</span> <span class="n">drv</span><span class="p">[</span><span class="s">&quot;id&quot;</span><span class="p">].</span><span class="n">ToString</span><span class="p">();</span> </span><span id="L-37"><a name="L-37"></a> <span class="kt">string</span> <span class="n">name</span> <span class="p">=</span> <span class="n">drv</span><span class="p">[</span><span class="s">&quot;name&quot;</span><span class="p">].</span><span class="n">ToString</span><span class="p">();</span> </span><span id="L-38"><a name="L-38"></a> </span><span id="L-39"><a name="L-39"></a> <span class="c1">// Get the bounds for the first column </span> </span><span id="L-40"><a name="L-40"></a> <span class="n">Rectangle</span> <span class="n">r1</span> <span class="p">=</span> <span class="n">args</span><span class="p">.</span><span class="n">Bounds</span><span class="p">;</span> </span><span id="L-41"><a name="L-41"></a> <span class="n">r1</span><span class="p">.</span><span class="n">Width</span> <span class="p">/=</span> <span class="m">2</span><span class="p">;</span> </span><span id="L-42"><a name="L-42"></a> </span><span id="L-43"><a name="L-43"></a> <span class="c1">// Draw the text on the first column </span> </span><span id="L-44"><a name="L-44"></a> <span class="k">using</span> <span class="p">(</span><span class="n">SolidBrush</span> <span class="n">sb</span> <span class="p">=</span> <span class="k">new</span> <span class="n">SolidBrush</span><span class="p">(</span><span class="n">args</span><span class="p">.</span><span class="n">ForeColor</span><span class="p">))</span> </span><span id="L-45"><a name="L-45"></a> <span class="p">{</span> </span><span id="L-46"><a name="L-46"></a> <span class="n">args</span><span class="p">.</span><span class="n">Graphics</span><span class="p">.</span><span class="n">DrawString</span><span class="p">(</span><span class="n">id</span><span class="p">,</span> <span class="n">args</span><span class="p">.</span><span class="n">Font</span><span class="p">,</span> <span class="n">sb</span><span class="p">,</span> <span class="n">r1</span><span class="p">);</span> </span><span id="L-47"><a name="L-47"></a> <span class="p">}</span> </span><span id="L-48"><a name="L-48"></a> </span><span id="L-49"><a name="L-49"></a> <span class="c1">// Draw a line to isolate the columns </span> </span><span id="L-50"><a name="L-50"></a> <span class="k">using</span> <span class="p">(</span><span class="n">Pen</span> <span class="n">p</span> <span class="p">=</span> <span class="k">new</span> <span class="n">Pen</span><span class="p">(</span><span class="n">Color</span><span class="p">.</span><span class="n">Black</span><span class="p">))</span> </span><span id="L-51"><a name="L-51"></a> <span class="p">{</span> </span><span id="L-52"><a name="L-52"></a> <span class="n">args</span><span class="p">.</span><span class="n">Graphics</span><span class="p">.</span><span class="n">DrawLine</span><span class="p">(</span><span class="n">p</span><span class="p">,</span> <span class="n">r1</span><span class="p">.</span><span class="n">Right</span><span class="p">,</span> <span class="m">0</span><span class="p">,</span> <span class="n">r1</span><span class="p">.</span><span class="n">Right</span><span class="p">,</span> <span class="n">r1</span><span class="p">.</span><span class="n">Bottom</span><span class="p">);</span> </span><span id="L-53"><a name="L-53"></a> <span class="p">}</span> </span><span id="L-54"><a name="L-54"></a> </span><span id="L-55"><a name="L-55"></a> <span class="c1">// Get the bounds for the second column </span> </span><span id="L-56"><a name="L-56"></a> <span class="n">Rectangle</span> <span class="n">r2</span> <span class="p">=</span> <span class="n">args</span><span class="p">.</span><span class="n">Bounds</span><span class="p">;</span> </span><span id="L-57"><a name="L-57"></a> <span class="n">r2</span><span class="p">.</span><span class="n">X</span> <span class="p">=</span> <span class="n">args</span><span class="p">.</span><span class="n">Bounds</span><span class="p">.</span><span class="n">Width</span><span class="p">/</span><span class="m">2</span><span class="p">;</span> </span><span id="L-58"><a name="L-58"></a> <span class="n">r2</span><span class="p">.</span><span class="n">Width</span> <span class="p">/=</span> <span class="m">2</span><span class="p">;</span> </span><span id="L-59"><a name="L-59"></a> </span><span id="L-60"><a name="L-60"></a> <span class="c1">// Draw the text on the second column </span> </span><span id="L-61"><a name="L-61"></a> <span class="k">using</span> <span class="p">(</span><span class="n">SolidBrush</span> <span class="n">sb</span> <span class="p">=</span> <span class="k">new</span> <span class="n">SolidBrush</span><span class="p">(</span><span class="n">args</span><span class="p">.</span><span class="n">ForeColor</span><span class="p">))</span> </span><span id="L-62"><a name="L-62"></a> <span class="p">{</span> </span><span id="L-63"><a name="L-63"></a> <span class="n">args</span><span class="p">.</span><span class="n">Graphics</span><span class="p">.</span><span class="n">DrawString</span><span class="p">(</span><span class="n">name</span><span class="p">,</span> <span class="n">args</span><span class="p">.</span><span class="n">Font</span><span class="p">,</span> <span class="n">sb</span><span class="p">,</span> <span class="n">r2</span><span class="p">);</span> </span><span id="L-64"><a name="L-64"></a> <span class="p">}</span> </span><span id="L-65"><a name="L-65"></a><span class="p">};</span> </span></pre></div> </td></tr></table>
combobox, winform